Hi,
Please update the screen shot of you trafic log,
as seems multiple request comming from the server where sysmantec might block the server request,
Please run LPA on that machine.
Title: How to run the Threat Analysis Scan in Symantec Help (SymHelp)
Article:TECH215519
Article URL http://www.symantec.com/docs/TECH215519
For your ref
Title: How to Run Load Point Analysis for Symantec Support
Article:TECH203028
Article URL http://www.symantec.com/docs/TECH203028